Atmosphere (대기)

Korean Meteorological Society (한국기상학회)
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An Analysis on the Spatial Scale of Yeongdong Cold Air Damming (YCAD) in Winter Using Observation and Numerical Weather Model

관측과 모델 자료를 활용한 겨울철 영동지역 한기 축적(Yeongdong Cold Air Damming; YCAD)의 공간 규모 분석

  • Nam, Hyoung-Gu (High Impact Weather Research Department, National Institute of Meteorological Sciences, KMA) ;
  • Jung, Jonghyeok (High Impact Weather Research Department, National Institute of Meteorological Sciences, KMA) ;
  • Kim, Hyun-Uk (High Impact Weather Research Department, National Institute of Meteorological Sciences, KMA) ;
  • Shim, Jae-Kwan (High Impact Weather Research Department, National Institute of Meteorological Sciences, KMA) ;
  • Kim, Baek-Jo (High Impact Weather Research Department, National Institute of Meteorological Sciences, KMA) ;
  • Kim, Seung-Bum (High Impact Weather Research Department, National Institute of Meteorological Sciences, KMA) ;
  • Kim, Byung-Gon (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University)
  • 남형구 (국립기상과학원 재해기상연구부) ;
  • 정종혁 (국립기상과학원 재해기상연구부) ;
  • 김현욱 (국립기상과학원 재해기상연구부) ;
  • 심재관 (국립기상과학원 재해기상연구부) ;
  • 김백조 (국립기상과학원 재해기상연구부) ;
  • 김승범 (국립기상과학원 재해기상연구부) ;
  • 김병곤 (강릉원주대학교 대기환경과학과)
  • Received : 2020.04.08
  • Accepted : 2020.05.20
  • Published : 2020.06.30
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Abstract

In this study, Yeongdong cold air damming (YCAD) cases that occur in winters have been selected using automatic weather station data of the Yeongdong region of Korea. The vertical and horizontal scales of YCAD were analyzed using rawinsonde and numerical weather model. YCAD occurred in two typical synoptic patterns such that low pressure and trough systems crossing and passing over Korea (low crossing type: LC and low passing type: LP). When the Siberian high does not expand enough to the Korean peninsula, low pressure and trough systems are likely to move over Korea. Eventually this could lead to surface temperature (3.1℃) higher during YCAD than the average in the winter season (1.6℃). The surface temperature during YCAD, however, was decrease by 1.3℃. The cold air layer was elevated around 120 m~450 m for LP-type. For LC-type, the cold layer were found at less than approximately 400 m and over 1,000 m, which could be thought of combined phenomena with synoptic and local weather forcing. The cross-sectional analysis results indicate the accumulation of cold air on the east mountain slope. Additionally, the north or northeasterly winds turned to the northwesterly wind near the coast in all cases. The horizontal wind turning point of LC-type was farther from the top of the mountain (52.2 km~71.5 km) than that of LP-type (20.0 km~43.0 km).

Keywords

References

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